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chromium/third_party/blink/web_tests/external/wpt/html/semantics/tabular-data/the-tbody-element/insertRow.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTMLTableSectionElement#insertRow</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id ="log"></div>

<table>
  <tbody id="testBody">
    <tr><td>ABCDEF</td></tr>
  </tbody>
</table>

<script>

var tbody = document.getElementById("testBody");

test(function () {
  var trEle = tbody.insertRow(0);
  assert_equals(tbody.rows[0], trEle);
  assert_equals(tbody.rows.length, 2);
}, "HTMLTableSectionElement insertRow(0)");

test(function () {
  var trEle = tbody.insertRow(-1);
  assert_equals(tbody.rows[tbody.rows.length - 1], trEle);
  assert_equals(tbody.rows.length, 3);
}, "HTMLTableSectionElement insertRow(-1)");

test(function () {
  var trEle = tbody.insertRow();
  assert_equals(tbody.rows[tbody.rows.length - 1], trEle);
  assert_equals(tbody.rows.length, 4);
}, "HTMLTableSectionElement insertRow()");

test(function () {
  var trEle = tbody.insertRow(tbody.rows.length);
  assert_equals(tbody.rows[tbody.rows.length - 1], trEle);
  assert_equals(tbody.rows.length, 5);
}, "HTMLTableSectionElement insertRow(rows.length)");

test(function () {
  assert_throws_dom("IndexSizeError", function () {
    tbody.insertRow(-2);
  });
}, "HTMLTableSectionElement insertRow(-2)");

test(function () {
  assert_throws_dom("IndexSizeError", function () {
    tbody.insertRow(tbody.rows.length + 1);
  });
}, "HTMLTableSectionElement insertRow(rows.length + 1)");

</script>